Triggered but regular?

I have a perfectly regular cycles, positive OPKs and positive progesterone tests. Meaning, I ovulate. 
My husband has low motility 
(high count and morphology)he is doing FertilAid and his numbers have improved 
My doctor wants to do an ovulation stimulating medication, a trigger shot and an IUI
My question is why?
Why does my ovulation need to be triggered ?

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